洛阳龙门高铁站大体积筏形基础混凝土温控措施分析与评价  

Analysis and Evaluation of Concrete Temperature Control Measures for Large Volume Raft Foundation of Luoyang Longmen Comprehensive Transportation Hub

作　　者：代均德 陈浩然 吴潇 李乐 梁斌 DAI Jun-de;CHEN Hao-ran;WU Xiao;LI Le;LIANG Bin(The City Construction Company Ltd.of China Railway 15th Bureau Group,Luoyang 471013,China;School of Civil Engineering,Henan University of Science and Technology,Luoyang 471000,China;The 1st Engineering Ltd.of China Railway 11th Bureau Group,Xiangyang 441104,China;China Railway 19th Bureau Group Co.,Ltd.,Beijing 100176,China)

机构地区：[1]中铁十五局集团城市建设有限公司,洛阳471013 [2]河南科技大学土木工程学院,洛阳471000 [3]中铁十一局集团第一工程有限公司,襄阳441104 [4]中铁十九局集团有限公司,北京100176

出　　处：《科学技术与工程》2023年第7期2976-2984,共9页Science Technology and Engineering

基　　金：国家自然科学基金(U1604135);中铁十一局集团有限公司重点科研课题(18-AⅡ-02);中铁十五局集团有限公司重点科研课题(2019C51);中铁十九局集团有限公司重点科研课题(19-A04)。

摘　　要：为研究大体积筏形基础混凝土水化热过程,防止因温差过大而产生温度裂缝,以洛阳龙门综合交通枢纽大体积筏形基础混凝土结构工程为背景,运用有限元软件MIDAS FEA建立模型分析了筏形基础内部温度沿基础厚度方向和水平方向的变化规律,对比了有无管冷系统作用下筏形基础水化热温度场分布情况。研究结果表明:筏形基础外表面产生裂缝可能性较大,应采取相应保护措施;管冷系统降温效果明显,对比有无管冷系统作用两种情况,发现在管冷系统作用下,基础内外温差为22.8℃,最大温差降低6.3℃,现场实测最大内外温差为24.1℃,单日最大降温速率为1.3℃,两者全部达到规范要求,养护完成后筏形基础外部未存在明显裂缝,证明通过布设管冷系统,能够有效降低水化热作用的影响,缩小内外温差防止产生温度裂缝,保证了筏形基础的整体性和稳定性。In order to study the hydration heat process of large-volume raft foundation concrete and prevent temperature cracks due to excessive temperature difference,taking the large-volume raft foundation concrete structure engineering of Luoyang Longmen comprehensive transportation hub as the background.The finite element software was used to establish the model,and the variation rule of the internal temperature of raft foundation along the thickness direction and horizontal direction was analyzed.The temperature field distribution of the heat of hydration of the raft foundation under the action of the pipe cooling system and without the pipe cooling system was compared.The results show that there is a large possibility of cracks on the outer surface of raft foundation,and corresponding protection measures should be taken.The cooling effect of pipe cooling system is obvious.By comparing the two cases of pipe cooling system and no pipe cooling system,it is found that when there is a pipe cooling system,the raft foundation temperature difference between inside and outside is 22.8℃,the maximum temperature difference reduced by 6.3℃,the actual maximum temperature difference between inside and outside of the site is 24.1℃,the maximum cooling rate is 1.3℃/d,all data are in accordance with the specification requirements.And the formwork is removed on site and no cracks are found on the surface of the raft foundation,it is proved that the pipe cooling system can effectively reduce the influence of hydration heat,reduce the temperature difference between inside and outside to prevent temperature cracks,and ensure the integrity and stability of raft foundation.

关 键 词：筏形基础 大体积混凝土 有限元分析 水化热 

分 类 号：TU528[建筑科学—建筑技术科学]